Add stable marshal of target info in acl package

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

v2/acl/marshal.go

@@ -9,6 +9,9 @@ const (
 	FilterMatchTypeField  = 2
 	FilterNameField       = 3
 	FilterValueField      = 4
+
+	TargetTypeField = 1
+	TargetKeysField = 2
 )
 
 func (t *Table) StableMarshal(buf []byte) ([]byte, error) {
@@ -83,10 +86,42 @@ func (f *HeaderFilter) StableSize() (size int) {
 	return size
 }
 
-func (t *HeaderType) StableMarshal(buf []byte) ([]byte, error) {
-	panic("not implemented")
+func (t *TargetInfo) StableMarshal(buf []byte) ([]byte, error) {
+	if t == nil {
+		return []byte{}, nil
+	}
+
+	if buf == nil {
+		buf = make([]byte, t.StableSize())
+	}
+
+	var (
+		offset, n int
+		err       error
+	)
+
+	n, err = proto.EnumMarshal(TargetTypeField, buf, int32(t.target))
+	if err != nil {
+		return nil, err
+	}
+
+	offset += n
+
+	n, err = proto.RepeatedBytesMarshal(TargetKeysField, buf[offset:], t.keys)
+	if err != nil {
+		return nil, err
+	}
+
+	return buf, nil
 }
 
-func (t *HeaderType) StableSize() int {
-	panic("not implemented")
+func (t *TargetInfo) StableSize() (size int) {
+	if t == nil {
+		return 0
+	}
+
+	size += proto.EnumSize(TargetTypeField, int32(t.target))
+	size += proto.RepeatedBytesSize(TargetKeysField, t.keys)
+
+	return size
 }

v2/acl/marshal_test.go

@@ -28,3 +28,25 @@ func TestHeaderFilter_StableMarshal(t *testing.T) {
 		require.Equal(t, filterFrom, filterTo)
 	})
 }
+
+func TestTargetInfo_StableMarshal(t *testing.T) {
+	targetFrom := new(acl.TargetInfo)
+	transport := new(grpc.EACLRecord_TargetInfo)
+
+	t.Run("non empty", func(t *testing.T) {
+		targetFrom.SetTarget(acl.TargetUser)
+		targetFrom.SetKeyList([][]byte{
+			[]byte("Public Key 1"),
+			[]byte("Public Key 2"),
+		})
+
+		wire, err := targetFrom.StableMarshal(nil)
+		require.NoError(t, err)
+
+		err = transport.Unmarshal(wire)
+		require.NoError(t, err)
+
+		targetTo := acl.TargetInfoFromGRPCMessage(transport)
+		require.Equal(t, targetFrom, targetTo)
+	})
+}